import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 张宇田
 * Date: 2024-10-27
 * Time: 18:14
 */
public class Test {
    public String sw(){

    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Char s = sc.nextLine();

        if ()
    }
}
